The Sunís gravity holds
the inner planets tightly as they revolve around the Sun. The orbits
of Mercury, Venus, Earth, and Mars revolve faster than the outer
planets because they have less distance to travel. They revolve
around the Sun all within a relatively flat plane.

The inner planets are rock and are
relatively small bodies. They donít have more than 2
satellites (Mars), with Venus and Mars having none. Mercury and Venus
rotate on their axis slower than any of the other planets.
Venus is the only planet that rotates clockwise, the other
planets rotate on their axis counterclockwise. Mercury has a
very eccentric orbit, similar to Pluto as it revolves around
the Sun. The inner planets do not have any rings like the gas giants.